Meet Our Team

Dr. Ratiner finished Louisiana State University (LSU) School of Medicine in New Orleans, where he grew up. He then moved to San Francisco, where he finished Internal Medicine Residency followed by a Rheumatology Fellowship at University of California San Francisco (UCSF). In August of 1999, Dr. Ratiner took over a highly respected Rheumatology practice in the San Fernando Valley of Los Angeles. Dr. Ratiner is currently a Clinical Instructor of Rheumatology at UCLA and holds a teaching position at the Northridge Hospital Family Practice Residency Program and Cedars Sinai Medical Center. In addition, he is on the board and planning committee of the Arthritis Foundation.

Dr. Ratiner is also a frequent speaker at local hospitals to physicians and at community centers to patients on topics such as osteoarthritis, rheumatoid arthritis, gout, osteoporosis, lupus, and fibromyalgia. Dr. Ratiner has recently authored several book chapters on osteoarthritis and research papers on Hepatitis C arthritis. Dr. Ratiner is also fluent in Russian.

Dr. Oh grew up on the East coast. She received her Bachelor’s degree from Tufts University and earned her medical degree from State University of New York at Buffalo. Her professional pursuits brought her to Southern California where she finished her Internal Medicine residency and Rheumatology fellowship at University of Southern California, where she now also holds a teaching position as a Clinical Instructor.

At the urging of her patients, Dr. Oh has studied the medical benefits of Eastern medicine. She incorporates her knowledge in both Western and Eastern medicine in developing treatment plans that are unique to the individual patients’ needs.

Born and raised in Southern California, Dr. Kreitenberg received his Bachelor of Science (B.S.) from the University of California, Los Angeles (UCLA) in the field of Physiological Sciences. Traveling across the world, he received his medical degree at the prestigious Technion – Israel Institute of Technology in Haifa, Israel.

Upon completing medical school, he relocated to Southern California where he finished his Internal Medicine Residency, followed by Rheumatology Fellowship, at the University of Southern California (USC) and Los Angeles County Medical Center.

Many of our rheumatology patients suffer from debilitating conditions such as osteoarthritis, rheumatoid arthritis, lupus, fibromyalgia, psoriatic arthritis and gout. As the newest addition to the practice, he possesses a fresh and unique approach to the practice of rheumatology. He is extremely passionate and strives to combine his clinical training skills with the latest in rheumatology research advances to help improve patients’ quality of life. Communication, as well as compassionate efficient care, are his strong-suits.

Dr. Kreitenberg is board certified in both internal medicine and rheumatology. He has is currently seeing patients at several nearby hospitals in the San Fernando Valley including Northridge Hospital Medical Center and West Hills Hospital. He is fluent in English, Spanish and Hebrew

Larisa Magid received her degree in Microbiology from Odessa State University in Ukraine where she grew up. In 2003 she graduated from UC Davis PA/FNP program. She is fully licensed as a Physician Assistant in the state of California by the California Medical Board and certified by National Committee on Certification of Physician Assistants (NCCPA).

Ms.Magid has over 20 years experience in the medical field. Last 7 years she has been specializing in Rheumatology and working with Dr. Ratiner and Dr Oh at RTMC.

In 2009 she received her Masters degree in Advanced Physician Assistant Studies with emphasis in Rheumatology from A.T.Still University in Mesa, Arizona.

About Us

Rheumatology Therapeutics Medical Center is a comprehensive center, located in the Los Angeles area, that specializes in the treatment of diseases that affect joints, muscles, and bones. Many of these diseases also involve the immune system.

Our center is staffed by medical doctors board certified in Rheumatology and Internal Medicine and by allied health professionals that are experienced and caring. By offering on-site Rheumatology Consultative Services, X-ray, DEXA, MRI, Laboratory, Physical Therapy, Clinical Trials, and Infusion Services we make your total care convenient for you.

RTMC is located in San Fernando Valley of Los Angeles. The center is only one block off the 101 Freeway and one block off Ventura Boulevard. The center is also across the street from Providence Tarzana Hospital, a leading hospitals in Los Angeles. The area around the center also has multiple pharmacies, grocery and retail stores, as well as a multitude of multicultural restaurants.

In an effort to accommodate our patients we have assembled an all star international staff. Different languages spoken by our staff to accomodate you include: English, Spanish, Russian, Farsi, Tagalog, and Korean Hebrew, Armenian, Japanese, Ukrainian.